Clay-plug sediment as the locus of arsenic pollution in Holocene alluvial-plain aquifers

The development of a sensitive alpha-NaYF4:Yb3+, Er3+ solid-phase upconverting platform (UCP) has been realized using Moringa oleifera leaf extract for selective detection of arsenic (As III) contamination in drinking water. The presence of polyphenols in the leaves extract is shown to induce luminescence resonance transfer (LRET), diminishing thereby the Er3+ upconverting red and green emissions activated by 980 nm excitation. However, addition of As3+ species interrupts the LRET process and restores emission proportionately. This feature allows platform to selectively detect arsenic pollution in water below the safe limit of 10 ppt. The uniqueness of UCP lies in monitoring the As3+ contamination in samples containing heavy ions (Cd2+, Hg2+) as well, without apparent effect on the signal reproducibility. UCP is also found to be insensitive to other interfering ions like Pb2+, H2PO4-, F-, Cl-, Ca2+, Mg2+, Sn2+, Cr6+, Fe2+ and Co2+, if present.<br><br>

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Relations of stream fish communities to physical and chemical parameters and land use in the Mississippi Alluvial Plain Ecoregion

Open-File Report ◽

10.3133/ofr0331 ◽

2003 ◽

Author(s):

Brian J. Caskey

Keyword(s):

Land Use ◽

Fish Communities ◽

Alluvial Plain ◽

Stream Fish ◽

Chemical Parameters ◽

Physical And Chemical Parameters ◽

Physical And Chemical

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Ground-Water Resource Assessment in the Rio Grande de Manati Alluvial Plain, Rio Arriba Saliente Area, Puerto Rico

10.3133/wri024132 ◽

2002 ◽

Keyword(s):

Puerto Rico ◽

Ground Water ◽

Water Resource ◽

Rio Grande ◽

Resource Assessment ◽

Alluvial Plain ◽

Water Resource Assessment ◽

Ground Water Resource

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Late Cretaceous stratigraphy and vertebrate faunas of the Markagunt, Paunsaugunt, and Kaiparowits plateaus, southern Utah

Geology of the Intermountain West ◽

10.31711/giw.v3i0.10 ◽

2016 ◽

Vol 3 ◽

pp. 229-291 ◽

Cited By ~ 1

Author(s):

Alan L. Titus ◽

Jeffrey G. Eaton ◽

Joseph Sertich

Keyword(s):

Late Cretaceous ◽

Foreland Basin ◽

Alluvial Plain ◽

Terrestrial Vertebrate ◽

The North ◽

Single Region ◽

The World ◽

Kaiparowits Plateau ◽

Fossil Preservation ◽

Fossil Records

The Late Cretaceous succession of southern Utah was deposited in an active foreland basin circa 100 to 70 million years ago. Thick siliciclastic units represent a variety of marine, coastal, and alluvial plain environments, but are dominantly terrestrial, and also highly fossiliferous. Conditions for vertebrate fossil preservation appear to have optimized in alluvial plain settings more distant from the coast, and so in general the locus of good preservation of diverse assemblages shifts eastward through the Late Cretaceous. The Middle and Late Campanian record of the Paunsaugunt and Kaiparowits Plateau regions is especially good, exhibiting common soft tissue preservation, and comparable with that of the contemporaneous Judith River and Belly River Groups to the north. Collectively the Cenomanian through Campanian strata of southern Utah hold one of the most complete single region terrestrial vertebrate fossil records in the world.

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